CBS News has learned that during the Sept. 11 attack on the U.S. Mission in Benghazi, the Obama Administration did not convene its top interagency counterterrorism resource: the Counterterrorism Security Group, (CSG).

"The CSG is the one group that's supposed to know what resources every agency has. They know of multiple options and have the ability to coordinate counterterrorism assets across all the agencies," a high-ranking government official told CBS News. "They were not allowed to do their job. They were not called upon."

Information shared with CBS News from top counterterrorism sources in the government and military reveal keen frustration over the U.S. response on Sept. 11, the night ambassador Chris Stevens and 3 other Americans were killed in a coordinated attack on the U.S. consulate in Libya.

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Counterterrorism sources and internal emails reviewed by CBS News express frustration that key responders were ready to deploy, but were not called upon to help in the attack.

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Absent coordination from Counterterrorism Security Group, a senior US counterterrorism official says the response to the crisis became more confused. The official says the FBI received a call during the attack representing Secretary of State Hillary Clinton and requesting agents be deployed....

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Another senior counter terrorism official says a hostage rescue team was alternately asked to get ready and then stand down throughout the night, as officials seemed unable to make up their minds.